Oscillating-current transformer.



R. A. WEAGANT.

OSCILLATING CURRENT TRANSFORMER.

APPLICATION FILED MAR. 15. 1912.

1,192,964. Patented Aug. 1, 1916.

, WITNESSES INVENTOR /4 a a B km A /4 9 /0 R FIG.3

UNITED STATES "PATENT OFFICE.

BOY A. WEAGANT, 0] BROOKLYN, NEW YORK, ASSIGNOR, BY MESNE ASSIGNMENTS, TO

SAMUEL m. xm'rnnn, or rrrrsnuncn, rENusYLvAN'IaAnnnALsnY M. BARRETT, or BLoomrmLn, NEW JERSEY, RECEIVERS:

OSGILL ATING-CUBBENT TRANSFORMER.

Specification of fLetters Patent.

Patented Aug. 1, 1916.

\ Application fl led March 15, 1912. Serial No. 684,033.

To all whom it may concern Be it known that I, RoY A. WEAGANT, a citizen of. the United States, residing at Brooklyn, in the State of New York, have invented certain new and useful Improvements in Oscillating-Current Transformers, set forth in the following specification.

My invention relates particularly to transformers for oscillating currents such as-employed in wireless 'telegraphy, and its primary objects are to effect changes in degrees of coupling without loss, to improve the coupling in the form of a transformer employing coils set at varying angles with each other, to permit the use of the most appropriate size of wire in a transformer without interfering with the respective adjustments best adapted to different wavelength, and to generally improve the construct-ion and operation of such transformers.

The invention is shown as applied to a wireless telegraph circuit in the accompany ing drawing, in which Figure 1 is a diagram showing the connec tion of the coils and Fig. 2 is a side elevation of a transformer switch and also showing the primary and secondary coils. Figs. 3and 4 are respectively an end and a side elevation of the primary coils mounted on an axis for rotation. Fig. 5 is an end view .of the primary and secondary coils; and Fig. 6 is a detail sectional view, showing two forms of wire in the secondary coil.

In the form of transformer here used, the primary coil is mounted inside the secondary coil in such a way that the coupling may be varied by turning the primary into positions where the turns will occupy various angles with the plane of the turns in the secondary. In such coils the primary is mounted at an angle of 45 degrees to its supporting shaft and consequently the inside diameter of the secondary must be large enough to allow of the rotation. The result is that when the coils are returned to position of maximum coupling,that is, the turns of wire in parallel planesthere is a large space all around between the primary and secondary giving a very loose coupling. This space I. reduce by using on the primary coil 14 of Figs. 3 and 4, an extra primary 9 and make arrangements for switching it in when using maximum coupling. Another defect in transformers is that on adjustments for shorter wave resentin lengths, there are many turns of wire not in use and when they idly overhang they have a deleterious efl'ect. I overcome this by a switching device which isolates parts of the coil not being used. Again on wave lengths of above 1200 meters it is very efiicient to use fiat strip coils. so as to obtain a large amount of inductance in a very small space, whereas with shorter wave lengths such coils are not ticular ind of wire most efiicient for that coupling. In order. to obtain these advantages, Iarrange the connections of the primary coil as shown in Figs. 1 and 2. From the antenna 7 the lead to the switch 8 is carried through an arm 8 to various taps on the primaries A or B as will be evident from the diagram. These coils A and B are the coils 9 and 14 in Figs. 3 and 4. The shaft 8 of the switch arm 8*, is made rigid with the arm 10' which makes contact with commutator segments 10 and 11, so connecting either one to ground 12. That is, when the arm.8 is in contact with any of the leads from the larger coil 14, or B in Fig. 1, thearm10 is in contact with the commutator segment 11, so that all of the turns of the wire in coil A or 9 in Fig. l, are isolated. This is the condition for any but the maximum coupling. On the other hand when the primary coil A, B, is so situated that its turns are parallel to those of the secondary coil, and the arm 8 on any of the leads to section A in Fig. 1, then the arm 10 is out of contact with. the comutator segment 11 and in contact with 10, which isolates all of the Wire of the larger coil B. 'It will be understood that the section 15 of coil 15 is made of a different form of wire from the rest of the coil, and designed to make the coupling more close.

By this construction I get a closer coupling on shorte? wave lengths, eliminating the influences of overhanging turns of the primary and use a wire in the secondary better adaptedfor short or long waves, according to the position of the transformer.

the parts wound with the par- 7 Other advantages will occur to those familiar with the art.

Having thus described my invention and illustrated its use, I claim the following:

1. A transformer, comprising a secondary coil and a revolubly mounted two part primary coil mounted eccentrically inside the secondary, and means for isolating either part of the primary coil when desired.

2. A transformer, comprising angularly adjustable primary coils, a secondary having a winding made of different forms of wire in different parts of the coil more effective respectively according to adjustment inthe primary.

3. An adjustable transformer primary composed of two separate coils each having adjustment tops and means to isolate one of said coils while using any part of the other.

4. A transformer switching mechanism, comprising a two coil primary, two series of contacts connected to upon said primary coils, a shaft carrying said coils, and a rigidly mounted switch on the same shaft in-- dependently connecting the two coils of the primary in the circuit.

5. A transformer, comprising several primary coils mounted to revolve eccentrically 'inside a surrounding secondary, said primary mounting being attached to switches- ROY WEAGANT.

WVitnesses H. J. GUERTH, E. D. Forums. 

